touch up readme
tweak readme for usb usage
bridge usb to serial port

This is a total hack, but allows using my python serial driver in the event no
serial driver can be found.
document hack
tweak doc
Merge branch 'master' of https://github.com/bewest/comlink2-uart
updated pump serial, added script to connect to dongle
Merge branch 'master' of https://github.com/mdijkstra/comlink2-uart